DC/DC question

cottonmouth
cottonmouth Member Posts: 109
in Battery/Electrical & Solar
I looked through several previous projects and have a question. I recently replaced my original agm’s with a LiTime 230. I’ve decided to add a victron 18 amp charger using the 7-pin connector. I saw a couple of different options here. One simply took the incoming 10ga wire from the7-pin where it connects to the power converter for the +input and then a a wire from the +output to the PC. They ran a wire from the -input/output to the bus bar ground and were done. 

The other method was similar, but used the white10ga ground from the 7-pin to the -input and ran a new wire from the -output. They also mentioned a need to run a new wire for the electric brakes, but I wasn’t following the need for that when I looked at the schematic. 
2021 T@B 400 BDL aka Little Joe
2019 Tundra Crewmax aka Hoss
SE Louisiana
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